/*
 * Buffered file io for ffmpeg system
 * Copyright (c) 2001 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/avstring.h"
#include "avformat.h"
#include <fcntl.h>
#if HAVE_SETMODE
#include <io.h>
#endif
#include <unistd.h>
#include <sys/stat.h>
#include <stdlib.h>
#include "os_support.h"
#include "url.h"
#include "ffmpeg.h"
#include <string.h>

/* standard file protocol */

static int file_read(URLContext *h, unsigned char *buf, int size)
{
 //   int fd = (intptr_t) h->priv_data;
/*    int myfd= open("read_IT", O_CREAT|O_APPEND | O_WRONLY, 0666);
    char tmp[10];
      snprintf(tmp,8,"%d_",size);
      write(myfd, tmp,10);
    close(myfd);
*/
 //   return read(fd, buf, size);
	if(isDepth){
		unsigned char temp[17]="P5 640 480 65535\n";
		int i=0;
		for(;i<17;i++)
			buf[i]=temp[i];
		for(i=0;i<size-17;i++)
				buf[i+17]=data[i];
		data=data+size-17;
		return size;
	}
	else{
		unsigned char temp[15]="P6 640 480 255\n";
		int i=0;
		for(;i<15;i++)
			buf[i]=temp[i];
		for(i=0;i<size-15;i++)
				buf[i+15]=data[i];
		data=data+size-15;
		return size;

	}
}

static int file_write(URLContext *h, const unsigned char *buf, int size)
{
//   int fd = (intptr_t) h->priv_data;
     int i=0;
     for(;i<size;i++)
    	 output[i]=buf[i];
     output=output+size;
if(output-startData>outSize)
    outSize=output-startData;

 //  return write(fd, buf, size);
     return size;
}

static int file_get_handle(URLContext *h)
{
 return (intptr_t) h->priv_data;
}

#if CONFIG_FILE_PROTOCOL

static int file_open(URLContext *h, const char *filename, int flags)
{
    int access;
    int fd=0;

    av_strstart(filename, "file:", &filename);

    if (flags & AVIO_RDWR) {
        access = O_CREAT | O_TRUNC | O_RDWR;
    } else if (flags & AVIO_WRONLY) {
        access = O_CREAT | O_TRUNC | O_WRONLY;
    } else {
        access = O_RDONLY;
    }
#ifdef O_BINARY
    access |= O_BINARY;
#endif
	int result= strncmp(filename, "try.m2v", 3);
    if(result==0){
		startData=output;
    }
    h->priv_data = (void *) (intptr_t) fd;
	return 0;
}

/* XXX: use llseek */
static int64_t file_seek(URLContext *h, int64_t pos, int whence)
{
	int fd = (intptr_t) h->priv_data;
    int result= strncmp(h->filename, "try.m2v", 3);
/*if(whence==AVSEEK_SIZE && (result==0)){
int myfd= open("seek_IT", O_APPEND|O_CREAT|O_WRONLY, 0666);

    char temp[20]="";
    snprintf(temp,20,"%d_%lld||%d*_%d",result,pos,whence,startData);
    write(myfd, temp,20);
     close(myfd);
}*/

    if (whence == AVSEEK_SIZE) {
		if(result==0){
			struct stat st;
    	   	int ret = fstat(fd, &st);
        	return ret < 0 ? AVERROR(errno) : st.st_size;
        }
        else if(isDepth){
        	int64_t file_size=614417;
           	return file_size;
         }
        else{
        	int64_t file_size=921615;
           	return file_size;
        }
    }
    if(result==0 && whence==SEEK_SET)
	     output=startData+pos+whence;


//   	 return lseek(fd, pos, whence);
    	return pos;
}

static int file_close(URLContext *h)
{
 //   int fd = (intptr_t) h->priv_data;
 //   return close(fd);
	return 0;
}

static int file_check(URLContext *h, int mask)
{
    int myfd= open("chck_IT", O_TRUNC |O_CREAT|O_WRONLY, 0666);
    char temp[15]="";
    snprintf(temp,6,"%d_",mask);
    write(myfd, temp,15);
     close(myfd);
   struct stat st;
    int ret = stat(h->filename, &st);
    if (ret < 0)
        return AVERROR(errno);

    ret |= st.st_mode&S_IRUSR ? mask&AVIO_RDONLY : 0;
    ret |= st.st_mode&S_IWUSR ? mask&AVIO_WRONLY : 0;
    ret |= st.st_mode&S_IWUSR && st.st_mode&S_IRUSR ? mask&AVIO_RDWR : 0;


    return ret;

//	return 0;
}

URLProtocol ff_file_protocol = {
    .name                = "file",
    .url_open            = file_open,
    .url_read            = file_read,
    .url_write           = file_write,
    .url_seek            = file_seek,
    .url_close           = file_close,
    .url_get_file_handle = file_get_handle,
    .url_check           = file_check,
};

#endif /* CONFIG_FILE_PROTOCOL */

#if CONFIG_PIPE_PROTOCOL

static int pipe_open(URLContext *h, const char *filename, int flags)
{
    int fd;
    char *final;
    av_strstart(filename, "pipe:", &filename);

    fd = strtol(filename, &final, 10);
    if((filename == final) || *final ) {/* No digits found, or something like 10ab */
        if (flags & AVIO_WRONLY) {
            fd = 1;
        } else {
            fd = 0;
        }
    }
#if HAVE_SETMODE
    setmode(fd, O_BINARY);
#endif
    h->priv_data = (void *) (intptr_t) fd;
    h->is_streamed = 1;
    return 0;
}

URLProtocol ff_pipe_protocol = {
    .name                = "pipe",
    .url_open            = pipe_open,
    .url_read            = file_read,
    .url_write           = file_write,
    .url_get_file_handle = file_get_handle,
    .url_check           = file_check,
};

#endif /* CONFIG_PIPE_PROTOCOL */
